The 'glottal stop', a catch in the breath. For some people, found in button [ˈbʌʔn̩], or between vowels across words: Deus ex machina [ˌdeɪəsˌʔɛksˈmɑːkɨnə]; in some nonstandard dialects, in a apple [ʌˈʔæpl̩].